Update dependency handlebars to v4.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
handlebars (source)	dependencies	minor	4.5.3 -> 4.6.0

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Release Notes

wycats/handlebars.js

### [`v4.6.0`](https://togithub.com/wycats/handlebars.js/compare/v4.5.3...v4.6.0) [Compare Source](https://togithub.com/wycats/handlebars.js/compare/v4.5.3...v4.6.0)

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